var b = new Number(3)  // 包装类型
console.assert(b instanceof Number)
console.assert(typeof b == 'object' ) // 对象的typeof统一为：object

b=2
console.log(b instanceof Number) // false
console.assert(typeof b == 'number') // number
// instanceof 后面跟着对象类型

function Person(){
}
var per = new Person()
console.assert( per instanceof Person )  // true
//console.log( getClass(per) )


console.log(__dirname)
console.log(__filename)


